U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Engineering Laboratory / Fire Research Division

National Fire Research Laboratory

Test22_RedCedar_R2

Table 1. Test Information
Name
Test22_RedCedar_R2
Date
Description

7/8" thick, 22.5" wide, 96"tall (in two sections, each 11.25"x96") planks of Western Red Cedar mounted to 1" thick Marinite board (new Marinite). Ignite using rectangular propane burner @ 60kW for ignition, burner on throughout experiment. Heat flux gauges mounted flush with fuel surface
Specimen
7/8" thick, 22.5" wide, 96" tall planks of Western Red Cedar
Ignition
propane burner
Project ID (s)
Vertical Upward Flamespread on Parallel Panels
Test Director
Leventon

Timelapse Video with Heat Release Rate Plot

Table 2. Summary of Test Results
Measurement Value Uc Unit
Peak Heat Release Rate, PHRR
322
18
kW
Time to Peak Heat Release Rate
2.05
0.17
min
Total Heat Released, THR
44.4
4.1
MJ
Gas Burner Total Heat Released, NGTHR
21.60
0.65
MJ
Heat Release Quality Confirmation, HRQC
 Not measured -
MJ/MJ
Net Specimen Mass (gravimetric), NM = Mi-Mf
3.74
0.28
kg
Net Effective Heat of Combustion = THR / NM
11.9
1.4
MJ/kg
O2 Yield = O2 Consumed / NM
1.27
0.10
kg/kg
CO2 Yield = CO2 Generated / NM
1.147
0.096
kg/kg
CO Yield = CO Generated / NM
0.0238
0.0020
kg/kg
Soot Yield = Soot Generated / NM
below detection limit
0.0021
kg/kg
Baseline Hood Exhaust Flow
17.24
0.52
kg/s
Test Duration = Time(Fire Out) - Time(Ignition)
9.70
0.03
min

Uc = Combined Expanded Uncertainty with 95% confidence level

Table 3. Summary of Test Input Parameters
Parameter Value Uc Unit
Fuel Type
Western Red Cedar
 - -
Hood Size
6
 -
m
Effective Duct Diameter
1.975
0.005
m
Exhaust Flow Correction Factor
1.028
0.029
 -
Net Heat of Combustion (per unit mass O2), Ef
13.61
0.54
MJ/kg
Net Heat of Combustion(per unit mass fuel), HOCf
20.00
4.00
MJ/kg
Initial Specimen Mass, Mi (gravimetric)
22.66
0.20
kg
Final Specimen Mass, Mf (gravimetric)
18.92
0.20
kg
Plot of Fire Heat Release Rate with event markers. Uncertainty bar shown at peak value.
Figure 1. Plot of Heat Release Rate data with event markers and error bars shown at peak.
Table 4. Summary of Observed Test Events
Event Time (min) Description Video Snapshot Image
1
0.00
Ignition
Ignition
peak
2.05
Peak HRR
Peak HRR
2
4.10
pull wire to expose shielded HF gauges
pull wire to expose shielded HF gauges
3
6.03
gas off
gas off
4
9.70
Fire Out
Fire Out

Table 5. Supplemental Data Plots

Plot of Oxygen Dry Volume Fraction in hood exhaust stream.
Plot of Oxygen Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Dioxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Dioxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Monoxide Dry Volume Fraction in hood exhaust stream.
Plot of Carbon Monoxide Dry Volume Fraction in hood exhaust stream.
Plot of Radiant Heat Flux data with event markers. r= radial distance from center of hood, h=height above floor.
Plot of Radiant Heat Flux data with event markers. r= radial distance from center of hood, h=height above floor.
Plot of Smoke Laser Extinction Coefficient in hood exhaust stream.
Plot of Smoke Laser Extinction Coefficient in hood exhaust stream.
Plot of Exhaust Duct Mass Flow Rate.
Plot of Exhaust Duct Mass Flow Rate.

Bryant, R. and Bundy, M. The NIST 20 MW Calorimetry Measurement System for Large-Fire Research, Technical Note (NIST TN) 2077, 2019
https://doi.org/10.6028/NIST.TN.2077

NIST Fire Calorimetry Database (FCD)
https://doi.org/10.18434/mds2-2314

Report Process Script Version
NFRL_Report_8.5.1
Last Updated November 8, 2023